JP2016215739A - Non-puncture tube and tire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a non-puncture tube capable of coping with variation of tire size regarding a wheel diameter, facilitating fitting into a tire as well as reducing weight of the tube by annularly connecting a plurality of tube split bodies each having a hollow structure.SOLUTION: In a non-puncture tube, a plurality of plastic tube split bodies Deach having a hollow structure and an outer shape corresponding to an inner shape in a cross-sectional view of a tire are connected in a circumferential direction via connection respective parts K to form an annular shape.SELECTED DRAWING: Figure 7

Description

  TECHNICAL FIELD The present invention relates to a no-puncture tube and a tire that are fitted in a tire such as a bicycle or a wheelchair to release a user such as a bicycle from a troublesome work corresponding to a pneumatic operation and a puncture.

  As a no-puncture tube, various technologies have been developed and applied as described below. The technique disclosed in Patent Document 1 is to inject and fill a molten gel into a tire tube and then harden it. While this technique has the advantage of being able to be applied to any tire tube, it has the disadvantage of requiring a special injection device.

  The technologies disclosed in Patent Documents 2 to 4 are to insert an annular lightweight foamed elastic body into a tire, and for gel injection, the weight of the tube is reduced. However, since the entire volume of the foamed elastic body is large, the weight is not reduced sufficiently to withstand use.

  The technique disclosed in Patent Document 5 is to form a plurality of hollow tube segments into an annular shape while fitting into a tire, and a certain weight reduction can be achieved, but various sizes related to wheel diameter are different. Tire tubes have the problem of being difficult to deal with.

JP 2005-96471 A Japanese Patent Laid-Open No. 10-329229 JP 2010-113101 A JP 2010-132101 A JP 2014-198552 A

  The present invention connects a large number of hollow tube segments in an annular shape to reduce the weight of the tube, and can cope with changes in the tire size related to the wheel diameter, and can be easily fitted into the tire. The challenge is to do.

  The invention of claim 1 for solving the above-described problem is that a large number of plastic tube divided bodies having an outer shape corresponding to an inner shape in a cross-sectional view of a tire are arranged in a circumferential direction via connecting portions. It is characterized by being formed in the annular | circular shape by connecting along.

  According to the first aspect of the present invention, the large number of tube segments connected in an annular shape through the coupling portion have a hollow structure, so that the weight can be reduced and the number of tube segments can be adjusted by adjusting the number of connections. Since the circumference of the tubes connected in an annular shape can be adjusted, by using the same tube divided body, it is possible to form tubes having the same thickness but different sizes according to the wheel diameter.

  Here, many tube division bodies are shape | molded using the injection molding die of resin which mold-opens in the direction perpendicular | vertical with respect to the end surface of the said tube division body, and the below-mentioned Claims 5-11 are carried out by this resin injection molding. It is possible to realize each technical item specified in (1). In addition, the total number of divisions of the plastic tube can be regarded as a curved surface where the surface on the ground surface side (outer side) is continuous with a large number of tube divisions connected in an annular shape. The ground contact state of the tire with respect to the contact surface is a continuous and smooth state, and it is necessary to divide the tire into a number that does not recognize the connection of the tube segments.

  According to a second aspect of the present invention, in the first aspect of the invention, the connection portion is a pair of connection locking pieces protruding from a rim fitting side portion of one opposing end face of two tube divided bodies connected to each other. And a connecting and locking hole formed in the same portion of the other opposing end surface.

  The portion exhibiting rebound resilience as a tube is a portion of a hollow structure housed inside the tire, and the portion on the rim fitting side of the tube that is fitted to the tire rim is a portion exhibiting rebound resilience is not. According to invention of Claim 2, the connection part which connects tube division bodies protrudes from the part by the side of the rim fitting of one opposing end surface of the two tube division bodies which comprise the tube and are mutually connected. A pair of connection locking pieces and a connection locking hole formed in the same portion of the other opposing end surface, the presence of the connection portion reduces the rebound resilience as a tube, The riding comfort when the tube is fitted to the tire is not deteriorated.

  According to a third aspect of the present invention, in the first or second aspect of the invention, the tube segments are connected to each other via a connecting portion having a connecting gap along the connecting direction, so that the tubes are connected in an annular shape. In this state, the perimeter changes.

  According to the invention of claim 3, the large number of tube divided bodies are connected to each other via the connecting portion in a state having a connecting gap along the connecting direction, and are formed in an annular shape having a tube shape. The circumference of a tube in which a large number of tube segments are connected in an annular shape can vary within a range of a length obtained by multiplying the maximum value of the connection gap by the number of tube segments. Therefore, when the tube having a large number of tube segments connected to the tire is fitted over the tire rim, the fitting is performed by setting the circumference of the tube to the maximum or close to this. Becomes easy. In the state where the tube is fitted in the tire, the circumferential length of the tube is shorter than that at the time of fitting, and a slight gap remains in the connecting portion, so that the end faces of the tube divided bodies directly contact each other. It is preferable that the circumference does not occur. Thereby, when fitting a tube in a tire, the malfunction that the end surfaces of a tube division body collide and a tube cannot be inserted in the tire can be avoided.

  Here, in a state where a tube in which a large number of tube divided bodies are connected via a connecting portion is fitted in the tire, a slight gap remains in the connecting portion, and the tire In the state where circumferential tension is generated, a large number of connected tube segments are fitted in the tire. Therefore, the individual tube segments are fitted in the tire in a frictionally fixed state due to the large frictional force between the entire outer circumferential surface of each tube segment and the inner circumferential surface of the tire. Since the slight gap remaining in the connecting portion is relatively small with respect to the thickness of the tire ground contact surface, it does not hinder the integrity of the connected tube segments and the tire.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the length along the connecting direction on the grounding surface side and the rim fitting side of the tube divided body is a circumferential length inside and outside the tire. The length corresponding to the difference is that the length on the ground contact surface side is slightly longer than the length on the rim fitting side.

  According to invention of Claim 4, the clearance gap between each tube division body in the grounding surface side can be made as small as possible. In a tire having a small wheel diameter, the total number of tube segments is reduced, and the gaps between the tube segments are likely to increase. However, according to the invention of claim 4, the gaps are made as small as possible. it can.

  According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the tube divided body has a hollow structure in which an inner side of an annular outer peripheral wall is partitioned symmetrically by a partition wall. It is a feature.

  When the partition wall is provided inside the outer peripheral wall as in the fifth aspect of the invention, the presence of the partition wall makes it difficult for the tube (tube divided body) to be structurally deformed in the cross section. Even if the partition wall is thin, there is no problem in strength, and weight reduction can be easily realized. The higher the ratio of the cross-sectional area of the partition wall to the cross-sectional area of the tube divided body, the higher the strength of the tube and the more difficult it is to deform. In the partition wall, the strength of the tube is increased as the respective wall portions constituting the partition wall are arranged vertically or close to each other. On the other hand, from the aspect of the arrangement shape of the partition wall, if the deformation of the tube in a cross-sectional view is not symmetric, the tire will shift to one side due to contact pressure, so the partition wall is symmetric. There is a need. As long as left-right symmetry at the time of deformation is ensured, the tube does not require a lateral displacement of the tire even if the vertical deformation is different.

  There are an infinite number of partition wall arrangement shapes, and by designing the partition wall arrangement shape according to the purpose of use of the tire, for example, a flexible tire that is easily deformable or a hard tire that is difficult to deform can be freely used. Can design. Further, when the contact pressure is applied to the tire, the outer peripheral wall and the partition wall are elastically deformed, so that the tire is deformed symmetrically in a cross-sectional view, and the outer peripheral wall and the partition wall are released by releasing the contact pressure. The partition wall is restored to its original shape.

  The invention of claim 6 is the invention of claim 5, wherein the partition wall is a single-layer or multi-layer partition comprising a regular polygon, a circle, or a combination of both shapes concentric with the center of the cross section of the tube divided body. Each partition wall part is connected to each other by a connecting wall, and the outermost partition wall part is connected to the outer peripheral wall by a connecting wall.

  The invention according to claim 6 is a single layer or plural by arranging the partition wall having a regular polygon, a circle, or a combination of both shapes concentrically with the center of the cross section of the tube divided body. A partition wall portion of the layer is formed, and the stress is dispersed during traveling of a bicycle or the like. When the tube segment is composed of only the outer peripheral wall, it is necessary to increase the thickness of the outer peripheral wall in order to withstand the grounding load, and it is difficult to achieve weight reduction. By using a plurality of layers, the stress acting on the tube divided body due to the ground load can be dispersed, local deformation of the tube can be prevented, and riding comfort is enhanced.

  Further, as the plastic generally becomes harder, the resilience tends to decrease. However, as in the invention of claim 6, the single-layer or multi-layer partition wall portion is formed inside the outer peripheral wall of the tube divided body. By arranging the, a structure that does not easily deform greatly can be obtained. As a result, a soft plastic can be used, and the tube has a good impact resilience. When used in a bicycle or wheelchair tire, the ride comfort is enhanced.

  The invention according to claim 7 is the invention according to claim 5 or 6, characterized in that the partition wall part constituting the partition wall does not include a vertical wall part or a horizontal wall part directly connecting the opposed parts of the outer peripheral wall. Yes.

  In the invention of claim 7, the partition wall portion constituting the partition wall includes a partition wall portion by a negative expression or an exclusion expression that does not include a vertical wall portion or a horizontal wall portion that directly connects the opposed portions of the outer peripheral wall. The shape is specified. That is, when the vertical wall part directly connecting the opposing parts of the outer peripheral wall constitutes all or part of the partition wall part, the ground pressure acts on the vertical wall part like a buckling load. Thus, the middle of the vertical wall portion may be largely bent sideways and buckled and deformed, which greatly deforms the entire cross-sectional shape of the tire itself. On the other hand, when the lateral wall part directly connecting the opposing part of the outer peripheral wall constitutes all or part of the partition wall part, the lateral wall part inhibits free deformation of the partition wall part, thereby This prevents the tire from being freely deformed. In any case, since the partition wall portion is easily damaged by fatigue by using the tire for a certain period of time, it is difficult to put it to practical use.

  The invention according to claim 8 is the invention according to any one of claims 1 to 4, wherein the tube divided body is provided with a plurality of through holes symmetrically along the connecting direction so that each of the outer peripheral wall and the partition wall is provided. A feature is that a portion having a function is formed.

  The invention according to claim 8 is to reduce the weight by providing a plurality of through holes along the connecting direction in the tube divided body symmetrically, and the remaining portions function as the outer peripheral wall portion and the partition wall portion. It has a structure that fulfills Moreover, since it has a shape in which a plurality of through holes are provided in the mold opening direction in the molding part, it can be molded by injection molding.

  According to a ninth aspect of the present invention, in the invention of any one of the first to eighth aspects, the torsional rigidity is increased by connecting each of the tube divided bodies in a state of being prevented from rotating by a rotation stop portion. It is characterized by that.

  Since many tube division bodies are only connected so as to form an annular shape via a single connection portion, the structure is weak against torsion. In particular, when fitting into a tire, a large number of tube segments connected only via a connecting portion are easily twisted and may be fitted into the tire while being twisted. Torsional deformation appears as distortion, and riding comfort of a bicycle or the like decreases. Therefore, by connecting the two tube divided bodies connected to each other through the connecting portion so as not to be rotated by the rotation-stopping portion, the torsional rigidity as a whole is improved, and a large number of annularly connected members are connected. When the tube divided body is fitted into the tire, a large number of annular tube divided bodies are not twisted, and the axis of the tube is arranged at a correct position concentric with the axis of the tire.

  According to a tenth aspect of the present invention, in the ninth aspect of the invention, the rotation stop portion is formed by a partition wall portion and an outer peripheral wall of one opposing end surface of two tube divided bodies connected to each other, or a partition wall. It is characterized by being configured by fitting a detent projection protruding from the divided hollow portion formed by the wall portions and a detent recess comprising the corresponding divided hollow portion of the other opposed end surface.

  According to invention of Claim 10, one of the division | segmentation hollow parts formed with the partition wall arrange | positioned inside the outer peripheral wall of one tube division body of the two tube division bodies connected mutually is made into a rotation recessed part. Since the structure is such that the rotation-depressing projection protruding from the divided hollow portion corresponding to the detent recess in the other tube divided body is fitted into the detent recess, the division that inevitably occurs in the structure Using the hollow portion, it is possible to connect a large number of tube segments without being twisted.

  The invention of claim 11 is the invention of any one of claims 1 to 8, wherein the innermost partition wall of the tube divided body is formed in a short cylindrical shape, and two adjacent tube divided bodies are arranged It is characterized in that they are connected to each other via an elastic connecting body made of an elastomer having a solid short columnar shape or a short cylindrical shape that is fitted and inserted into the partition walls.

  According to the eleventh aspect of the present invention, since the two adjacent tube segments are fitted and inserted into each innermost short cylindrical partition wall with an elastomeric coupling body, The connecting body acts to reduce deformation of each tube divided body constituting the tube during traveling of the bicycle or the like, and the elastic resilience body made of elastomer increases the rebound resilience of the entire tube, so that the bicycle Further, the force required for advancing a wheelchair or the like can be reduced, and the adjacent tube segments are connected via the elastic connector, so that an annular tube is fitted to the tire. When inserting, the tube can be prevented from being twisted. In addition, since the elastic coupling body is made of a lightweight elastomer, an increase in weight due to the elastic coupling body can be minimized.

  According to a twelfth aspect of the present invention, in the invention according to any one of the first to eleventh aspects, the tube divided body is formed of a thermoplastic plastic.

  According to the invention of claim 12, by using an injection mold having a structure in which the mold is opened along the connecting direction of the tube divided bodies, it is possible to injection mold hollow tube divided bodies having partition walls having various structures. It becomes. Further, depending on the structure of the partition wall, it becomes possible to use resins having various mechanical properties, and mass production of the tube divided body becomes possible.

  The invention of claim 13 is characterized in that, in the invention of claim 12, the thermoplastic plastic is a thermoplastic elastomer having a flexural modulus of (50 to 500) MPa.

  The thermoplastic elastomer is excellent in creep resistance and is suitable as a material for a no-puncture tube divided body in terms of durability and ride comfort. In the invention of claim 13, if the flexural modulus of the thermoplastic elastomer is less than 50 MPa, it is too soft, and it is necessary to increase the number of partition walls or to increase the thickness thereof. If the tube is not reduced in weight and its flexural modulus exceeds 500 MPa, it is too hard to ensure adequate rebound resilience for obtaining high ride comfort.

  The invention of claim 14 is a tire formed by annularly connecting a plurality of plastic hollow tire divided bodies divided in the circumferential direction, the tire divided body having an annular outer peripheral wall. The inner side is partitioned by a partition wall to form a hollow structure, and many tire segments that are connected in an annular shape are fitted to the tire rim of the segmented structure that is divided into two in a cross-sectional view. The remaining portion is exposed.

  According to the invention of claim 14, by connecting a large number of plastic tire divided bodies having a hollow structure by partitioning the inside of the annular outer peripheral wall with the partition wall along the circumferential direction, The tire is a tubeless tire because the rim side portion is fitted to the tire rim having a divided structure divided into two in a cross-sectional view and the remaining portion is exposed. Can be realized. The application of the tire according to the invention of claim 14 requires that the load acting on the tire be small, and typically includes a stroller.

  According to the present invention, since a tube fitted into a tire is formed by connecting a large number of hollow tube divided bodies made of plastic in an annular shape via a connecting portion, a change in the total number of connections Thus, it is possible to form tube segments having the same thickness and different sizes according to the wheel diameter. In addition, when the connecting portion has a connecting gap along the connecting direction, when fitting into the tire, by making the circumferential length maximum or close to the maximum, the fitting to the tire is facilitated and the tire is fitted into the tire. In this state, the tire is elastically deformed so as to be slightly larger in cross section, so that the entire outer peripheral surface of the tube divided body is in close contact with the inner peripheral surface of the tire, and the individual tube divided bodies are obtained by the contact friction force. Even if it has a connection clearance along the connection direction, each tube division body is integrated with a tire in the state of friction fixation with the above-mentioned contact frictional force, and is firmly inserted.

  In addition, when the tube divided body has a hollow structure in which the inner side of the outer peripheral wall is partitioned left and right symmetrically by the partition wall, the tube in which a large number of tube divided bodies are connected via the connecting portion is grounded. When it reaches the part, it is elastically deformed integrally with the tire, and when it reaches the non-ground part, it is restored to its original shape, so that appropriate rebound resilience is obtained and riding comfort is improved. In particular, when the partition wall is formed in a polygon, a circle, or the like concentric with the center of the outer peripheral wall, the wall portion including the outer peripheral wall is formed in a plurality of layers, so that it is possible to obtain better rebound resilience.

  Many tube divisions can be mass-produced by using an injection mold that is die-cut in a direction perpendicular to the end face of the tube division.

It is a front view of the tube C in accordance with the present invention coupled to an annular via a number of tubes split bodies D ₁ connecting portion K. (A), (b) are a front view and a rear view of the tube divided bodies D _1, respectively. (A) is a left side view of a tube divided bodies D _1, (b) is a sectional view taken along line X-X of (a). (A) is a perspective view of two tubes divided bodies D ₁ being connected to each other, (b) are a perspective view of the tube divided bodies D ₁ from an oblique lower side. (A) is a sectional view taken along the connecting direction before coupling the plurality of tubes divided bodies D _1, (b) is a similarly cross-sectional view of the coupling state. A plurality of tubes split bodies D ₁ is a perspective view of a state of being connected. Tube C according to the present invention is a front view of a state in which a partially cutaway state fitted in the tire T _1. It is the YY line expanded sectional view of FIG. (A), (b) are a front view and a left side view of a tube split body D _2, respectively. (A), (b) are a front view and a left side view of each tube divided body D _3. (A) is a cross-sectional view of a tube split body D _4, (b) is a perspective view of a tube split body D ₄ are each other connected. It is a front view of a tube divided bodies D _5. (A) is a sectional view taken along the connecting direction before coupling the plurality of tubes divided bodies D _5, (b) is a similarly cross-sectional view of the coupling state. (A) ~ (e) is a front view of a tube split body D ₆ to D _10. (A) ~ (c) is a front view of a tube split body D ₁₁ to D _13. (A) ~ (f) is a front view of a tube split body D ₁₄ to D _19. (A) ~ (c) is a front view of a tube split body D ₂₀ to D _22. FIG. 3 is a front view of a state where a tire T _{0 according} to the present invention is fitted into a tire rim R ₀ . It is the ZZ sectional view taken on the line of FIG.

  Hereinafter, the present invention will be described in more detail with reference to a plurality of examples.

First, with reference to FIGS. 1 to 5, a description will be given of the tube C that is connected in a ring shape via a coupling portion K multiple tube divided bodies D _1. Tube divided body D ₁ is an injection molded article of plastic, it has a cross-sectional shape close to a circle corresponding to the inner peripheral shape of the tire T _1, is fitted in close contact with the inner peripheral surface of the tire T ₁ From the divided body main body 1 and the rim-side convex portion 2 that is integrally formed with a part of the outer peripheral portion of the divided body main body 1 so as to bulge outward and is disposed in the tire rim R ₁ . Become. Tube divided bodies D ₁ of the first embodiment, by connecting the 100 annularly, it is an tube C to be fitted into the tire T ₁ of the (26 × 1.95). Conversely, the tube divided bodies D ₁ of the first embodiment can be said to be 100 divided structure. The divided body portion 1 has a regular hexagonal outer shape inside the outer peripheral wall 3 having a nearly circular shape, and a partition wall 4 having a circular inner shape is disposed concentrically, and the outer peripheral wall 3 and the partition wall 4. Is connected with the connecting wall 5 at the apex of the regular hexagon outside the partition wall 4 to form a “two-layer structure”. The partition wall 4 having a regular hexagonal outer shape has a pair of opposing sides (surfaces) arranged in parallel with the locking piece forming plate portion 13. The overall shapes of the outer peripheral wall 3 and the partition wall 4 are substantially short cylindrical and hexagonal, respectively, and the connecting wall 5 is flat. Therefore, the tube segment D ₁ has a hollow structure, and a total of six trapezoidal hollow portions 7 are arranged outside the central circular hollow portion 6, so that the hollow portion inside the outer peripheral wall 3 is The structure is divided into a plurality of parts by the partition wall 4 and the connecting wall 5. As a result, when the tube C in which a large number of the tube divided bodies D ₁ are connected in an annular shape is fitted and used in the tire T ₁ , the tube C is deformed by the contact pressure, that is, the tube C When the tube divided bodies D ₁ constituting the tube are deformed, each tube divided body D ₁ has a left-right symmetric shape in front view so as not to be laterally displaced.

In order to form a tube C by connecting a large number of tube divisions D ₁ in an annular shape via the connecting portion K, the outer circumference of the outer surface on the ground contact surface side is the inner circumference of the tire rim side in the connected state. The length L ₄ on the ground contact surface side of the tube divided body D ₁ is slightly longer than the length L ₅ on the tire rim side so that the tube division body D ₁ can be connected longer than the circumference. That is, both end faces 8 of the tube divided bodies D ₁ is non-parallel to. Incidentally, the outer peripheral surface of the outer peripheral wall 3 of the tube divided bodies D ₁ is formed parallel to the outer axis J of the hexagonal cylindrical partition wall 4 in which the regular hexagonal shape.

The rim-side convex portion 2, a coupling engagement piece 11 of the coupling portion K for coupling two tubes divided body D ₁ together and connecting locking hole 12 is formed. That is, a plate-like locking piece forming plate portion 13 is provided so as to protrude perpendicularly to the end surface 8 on the one end surface 8 side of the rim-side convex portion 2 of the tube divided body D _1. A groove portion 14 opened at the distal end is formed in the center portion in the width direction of the distal end portion (free end portion) of the stop piece forming plate portion 13, so that the portions on both sides of the groove portion 14 are a pair of connecting members. It is a stop piece 11. The pair of connection locking pieces 11 protrudes in the width direction of the locking piece forming plate portion 13, and can be elastically deformed in the width direction of the locking piece forming plate portion 13 due to the presence of the groove portion 14. It has become. In the side view of the tube segment D ₁ , the rim-side convex portion 2 has a large notch recess 15 having a rectangular side surface shape from the center in the length direction (thickness direction) of the tube segment D _1. The rim-side convex portion 2 is formed in the length direction (thickness direction) of the tube divided body D ₁ by the notched concave portion 15. . That is, coupling engagement piece 11 to the first divided portion 2a of provided a rim-side protrusion 2, the second divided part 2b of the rim-side protrusion 2, coupling engagement pieces another tube divided bodies D ₁ 11 There coupling locking hole 12 to be locked through engagement is formed to penetrate along the length of the tube divided bodies D ₁ (the thickness direction). In a cross-sectional view of the notch recess 15 portion of the tube divided body D ₁ , the portions excluding both ends of the notch recess 15 are the inner end surfaces of the both ends and the connection locking hole 12. It is formed slightly lower than that and has a concave shape. In addition, the formation end of the groove part 14 formed in the front-end | tip part of the latching piece formation board part 13 in order to make a pair of coupling latching piece 11 elastically deformed easily, the back surface 11a of the pair of coupling latching piece 11 concerned It is formed slightly exceeding.

Therefore, as shown in FIG. 3 and FIG. 4, when two tube division bodies D ₁ are connected, a pair of connection locking pieces formed on the rim-side convex portion 2 of _one tube division body D _1. 11 the locking piece forming plate part 13 is a part of, is pushed by inserting the connecting locking hole 12 formed in the rim-side protrusion 2 of the other tube divided body D _1, one tube divided body D ₁ The pair of connecting locking pieces 11 formed at the tip of the locking piece forming plate portion 13 is restored to its original shape at the notch recess 15 portion from a state where it is elastically deformed so that the width becomes narrow. in, exits from the other of the coupling locking hole 12 of the tube divided bodies D _1, one pair of coupling engagement piece 11 of the tube divided bodies D ₁ is, of other tube divided body D ₁ of the rim-side protrusion 2 Locked to the inner end surface of the second dividing portion 2b. Thus, two tubes divided bodies D ₁ is provided with a coupling engagement piece 11 formed on one, by a coupling locking hole 12 formed on the other, they are each other connected.

In a state where a large number of tube divisions D ₁ are connected in an annular shape via a connecting portion K, the connecting portion K has a predetermined connecting gap E along the connecting direction and is connected in an annular shape. Thus, the circumferential length is changed by adjusting the connecting gap E. In a state where a large number of tube divisions D ₁ are connected in an annular shape, there is no connection gap E or it is small and the end faces 8 of the adjacent tube divisions D ₁ are in close contact with each other or slightly between the end faces 8. When there is only a gap between the tire T ₁ and the tire T ₁ , the tire rim R ₁ cannot be overcome, and the tube C in which a large number of tube divisions D ₁ for the tire T ₁ are connected in an annular shape. Is difficult to fit. Therefore, when the connection gap E is positively provided and the tube C is fitted into the tire T ₁ , more accurately, the connection gap E is divided into two tubes divided by the connection gap E. By fitting the gaps between the opposing end faces 8 of the body D ₁ , the perimeter can be increased to enable the fitting.

In a state fitted tube C is the tire T _1, to form a natural gap between adjacent tubes split body D _1, as described later, by shifting the aggregation of the coupling gap E, the tire T ₁ The circumference of the tube C is shorter than that when fitting to the tube C. In a state where the tube C is fitted into the tire T _1, the tire T ₁ is was slightly stretched (circumference is elastically deformed to be longer) in cross section when viewed in a state, the inner circumference of the tire T ₁ surfaces are in close contact over the entire surface on the outer peripheral surface of the tube divided bodies D _1, if it were, in a state in which individual tubes split bodies D ₁ have been independently tightly fixed to the tire T _1. In other words, the coupling and if the tube divided bodies D ₁ concatenates a number of tubes split bodies D ₁ in a ring shape, during the period until fitted to the tire T _1, great significance in terms of holding the annular shape After being fitted into the tire T ₁ , the annular shape does not collapse, and the individual tube segments D ₁ may be displaced in the circumferential direction with respect to the tire T ₁ . The maximum value of the connection gap E is (E ₁ + E ₂ ), and even if such a gap occurs in the tire, vibration or the like does not occur depending on the thickness of the tire.

The connection state of the tube divided bodies D ₁ of the FIG. 5 (b), the linking gap E becomes E _1. E ₁ is a divided connection gap between the end faces 8 of the rim-side convex portions 2 of the two adjacent tube divided bodies D ₁ , and E ₂ is a back surface 11a of the connection locking piece 11 and a rim-side convex portion. It is a division | segmentation connection clearance gap between the inner end surfaces of 2nd 2nd part part 2b. When the tube C is fitted into the tire T ₁ , the connecting gap E becomes the sum of the divided connecting gap E ₁ and the E ₂ and becomes relatively large, so that the circumferential length of the tube C becomes long.

Further, when the tube divided bodies D ₁ are simply connected via the connecting portion K, the connected tube divided bodies D ₁ rotate relatively and are connected when fitted into the tire T ₁ . Since the tube segment D ₁ remains relatively rotated and is slightly twisted as a whole, the tube C in the tire T ₁ is partially left-right asymmetric. The ride comfort of a bicycle or the like is reduced. Therefore, as shown in FIG. 2 and FIG. 3, the detent protrusion such that the inner shape of the trapezoid hollow portion 7 closest to the locking piece forming plate portion 13 among the plurality of trapezoid hollow portions 7 becomes the outer shape. A portion 16 projects from the end face 8. One tube divided body D detent protrusion 16 formed to _1, is fitted to the other tube divided body D ₁ corresponding detent recess 17 is trapezoidal hollow portion 7, the tube divided to be connected to each other The body D ₁ is connected in a state of being prevented from rotating, so that the synthesis of the axis J of many tube divisions D ₁ becomes the circular axis JC of the tube C arranged in the same plane, It coincides with the circular axis JT of the tire T ₁ (see FIG. 7).

Tube divided bodies D ₁ as described above, by die cutting in a direction along its axis J, making it possible to injection-molding of plastic, thereby enabling mass production. However, a slide mold that slides in a direction perpendicular to the axis J is used in combination for forming the notch recess 15 of the rim-side convex portion 2 and the pair of connection locking pieces 11.

Tube divided bodies D ₁ of the first embodiment, as the tube C connects 100 that the annularly, there is fitted into the tire T ₁ of the (26 × 1.95), each unit shown in FIG. 2 The dimensions of L ₁₁ = 38.4 mm, L ₁₂ = 44.7 mm, L ₁₃ = 20 mm, L ₁₄ = 19.8 mm, L ₁₅ = 16.8 mm, t ₁₁ = 2.0 mm, t ₁₂ = 2.8 mm. , T ₁₃ = 2.5 mm.

In order to fit the tube C in which a large number of tube divided bodies D ₁ are annularly connected via the connecting portion K into the tire T ₁ , the opposing end surfaces of the two tube divided bodies D ₁ connected to each other The tire C is moved over the tire rim R ₁ and accommodated in the tire T ₁ in a state where the circumferential length of the tube C is increased so that the divided connection gap E ₁ between the two is increased. In a state where the tube C is accommodated in the tire T ₁ , the circumference of the tube C is shorter than that at the time of fitting by selecting the optimum divided connection gap E ₁ by itself. Also, a number of tubes C of the tube divided body D ₁ is connected annularly, around the stopper protrusion 16 and the detent recesses 17, joined two tubes divided bodies D ₁ was is prevented Megura Therefore, even when the tube C is accommodated in the tire T ₁ , the tube C is not twisted along the circumferential direction, and the circular axis JC is aligned with the circular axis JT of the tire T _1. Then, they are arranged on the same plane. Thus, a number of tubes split bodies D ₁ constituting the tube C that is fitted into the tire T ₁ are both arranged symmetrically in cross-section view.

In a state where the tube C is fitted into the tire T _1, that the tire T ₁ is is slightly elastically deformed, the inner circumferential surface of the tire T ₁ is in close contact against the outer peripheral surface of each tube divided bodies D ₁ In this state, each bead portion 132 of the tire T ₁ is locked to each locking portion 131 of the tire rim R ₁ . Therefore, in the state where the tube C is fitted in the tire T ₁ , each tube divided body D ₁ has a line segment connecting the axis J of the partition wall 4 and the specific point in the center in the width direction of the rim side convex portion 2. It is elastically deformed so as to be slightly longer.

As described above, in a state where the tube C in which a large number of the tube divided bodies D ₁ are connected via the connecting portions K is fitted into the tire T ₁ , the respective end surfaces 8 of the adjacent tube divided bodies D ₁ facing each other. There is a slight split connection gap E ₁ between the tire T _{1 and} the inner peripheral surface of the tire T ₁ in close contact with the outer peripheral surface of the divided body main body ₁ of each tube divided body D _1. In spite of the presence of the split connection gap E ₁ between the end faces 8, a large number of tube segments D ₁ are integrally connected in the circumferential direction. the number of tubes split bodies D ₁ and the tire T _1, has a if it were integrated state.

As described above, in a state where a large number of connected tube segments D ₁ are fitted in the tire T ₁ , the large number of tube segments D ₁ are integrally connected in the circumferential direction. the number of tubes split bodies D ₁ and the tire T _1, have become as if integrated state, the tube C that is fitted into the tire T ₁ of the bicycle, by ground contact pressure F acts during traveling As shown by a two-dot chain line in FIG. 8, an appropriate riding comfort is ensured by a repulsive elastic force generated by elastic deformation symmetrically with respect to a vertical line passing through the axis J of the partition wall 4. The In addition, when the continuous pressure receiving time of the ground pressure exceeds a certain time, the tube segment D ₁ is creep-deformed so as to be slightly flat, but elastically deformed and rebounded based on the creep-deformed state. the elastic occurs, the tube divided bodies D ₁ is be creep deformation, the riding comfort is ensured.

  The number of tube divisions connected in an annular shape, that is, the number of tube divisions, is that it is not recognized that a large number of tube divisions are connected in a state where a tire fitted with a tube is used, in other words, Even if it is light "rattle" in the connection part of a tube division body, it is necessary for it not to generate | occur | produce at all. Thereby, riding comfort, such as a bicycle, can be ensured. For example, in the case of a tube fitted in a tire of (26 × 1.95), the total number of divisions is about (96 to 104), and the total number of divisions of the tube is proportional to the inner diameter size of the tire. And increase.

Further, on the condition that the thickness of the tire T ₁ is constant, the tube C that can be fitted into a plurality of tires T ₁ having different wheel diameters is adjusted by adjusting the total number of connections of the same tube divided body D ₁ . Formation is possible. For example, a tube that can be fitted into a tire of (27 × 1.95) can be formed by increasing the number of tube divisions D ₁ compared to the case of a tire of (26 × 1.95). It becomes. Here, the tube C by the wheel diameter of the tire is changed adjustment of the circumferential length is the change of the total number of tubes split bodies D ₁ connecting, between adjacent tubes split body D ₁ of the opposite end faces 8 by performing by the adjustment of the split connecting gaps E _1, the optimum circumferential length of the tube C is obtained.

The tube segment D ₁ was formed by injection molding using a blend material obtained by blending a thermoplastic polyester elastomer having a bending elastic modulus of 110 Mpa and a thermoplastic polyurethane elastomer having a bending elastic modulus of 35 Mpa at a ratio of (1/1). As a total of 100 tubes by connecting the tube divided bodies D ₁ annularly, fitted into the tire T ₁ of the (26 × 1.95). The weight of this tube was 1,280 g, and when the weight of the air tube was subtracted from 400 g, the weight increase as a tire was 880 g, and a lightweight tube could be realized. The riding comfort of the bicycle equipped with the tire T ₁ was close to that of a pneumatic tire. In addition, as a result of a 5,000 km running test under the test conditions of overcoming a step of 90 kg load, 5 km / h in a rotation test in accordance with JISK6302, the tube segment D ₁ has a fatal problem such as cracking. It did not occur and only creeped flat by 5 mm.

Tube split body D ₂ of the second embodiment is shown in FIG. 9, the tube divided body D ₁ equal or corresponding parts of the first embodiment, the same reference numerals, parts different from the tube divided body D ₁ Will be explained mainly. The tube divided body D ₂ includes a divided body main body 1 and a rim-side convex portion 2, and the overall shape and the size of the cross section are the same as the tube divided body D ₁ , but the inner wall of the outer peripheral wall 3 is partitioned. Although the wall 24 has a “two-layer structure” arranged concentrically, only the shapes of the partition wall 24 and the connecting walls 25 and 26 are different. That is, the partition wall 24 is a substantially regular hexagonal cylinder having a regular hexagonal shape inside and outside, and the outer shape of the first embodiment is in a state where the phase is shifted by 30 ° with respect to the regular hexagonal partition wall 4, that is, opposed to each other. Of the total three sets of vertices, one set of vertices is arranged so as to be positioned in the vertical direction, and all the apexes outside the partition wall 24 and the outer peripheral wall 3 extend along the axis J. Except for one set of apexes facing each other in the vertical direction, the other two apexes are connected to each other by a flat connecting wall 25 and are opposed to each other inside the partition wall 24. Are connected in a state where two flat connecting walls 26 intersect at an axis J. As a result, a total of six trapezoidal hollow portions 27 having the same shape are formed between the outer peripheral wall 3 and the partition wall 24, and a pair of rhombus hollow portions 28 and triangular hollow portions 29 are formed inside the partition wall 24. Is formed.

Here, when the inside of the partition wall 24 is connected by connecting the vertices facing each other in the vertical direction, the inside of the outer peripheral wall 3 is connected by the vertical wall passing through the axis, and the vertical wall is When the ground pressure exceeding a certain value acts for a long time while inhibiting the free elastic deformation of the tube divided body D _2, the ground pressure acts as a buckling load on the vertical wall. This is because there is a risk of buckling deformation, and the function of the tube divided body that produces rebound resilience by elastic deformation is not achieved. On the other hand, when the connecting wall is a horizontal wall that directly connects the opposed portions of the outer peripheral wall, the natural elastic deformation of the entire tube is inhibited by inhibiting the natural elastic deformation of the portion above the horizontal wall. Since the appropriate rebound resilience due to is not obtained and the ride comfort is reduced, the presence of the horizontal wall is not recognized.

Tube split body D ₂ of Example 2, as a tube C connects 100 that the annularly, there is fitted into the tire T ₁ of the (26 × 1.95), each unit shown in FIG. 9 The dimensions are L ₂₁ = 38.5 mm, L ₂₂ = 44.5 mm, L ₂₃ = 22.5 mm, L ₂₄ = 20.0 mm, L ₂₅ = 17.0 mm, and t ₂₁ = 1.7 mm.

The thermoplastic polyester elastomer of the flexural modulus 160 MPa, and the tube split body D ₂ is molded by injection molding. As a total of 100 tubes by connecting a tube split body D ₂ annularly, fitted into the tire T ₁ of the (26 × 1.95). The weight of this tube was 1,020 g, and when the weight of the air tube was subtracted from 400 g, the weight increase as a tire was 620 g, and a lightweight tube could be realized. The riding comfort of the bicycle equipped with the tire T ₁ was close to that of a pneumatic tire. In addition, as a result of conducting a 5,000 km running test under the test conditions of overcoming a step of 90 kg load, 40 km / h and 5 mm in the rotation test in accordance with JISK6302, the tube segment D ₂ has a fatal problem such as cracking. It did not occur and only creeped flat by 4.5 mm.

Is the tube divided body D ₃ of Example 3 is shown in FIG. 10, the tube divided body D ₁ equal or corresponding parts of the first embodiment, the same reference numerals, parts different from the tube divided body D ₁ Will be explained mainly. The tube divided body D ₃ is composed of a divided body main body 1 and a rim side convex portion 2, and the overall shape and the cross-sectional size are the same as the tube divided body D ₁ , but the inner side of the outer peripheral wall 3 is positive. This is a “three-layer structure” in which hexagonal partition walls 33 and 34 are arranged concentrically. The regular hexagonal partition wall 33 is disposed on the inner side of the outer peripheral wall 3 in the same manner as the partition wall 4 of the tube divided body D ₁ of the first embodiment. The partition wall 34 is arranged with a phase shifted by 30 ° with respect to the partition wall 4. The outer peripheral wall 3 and the outer side of all the vertices of the partition wall 33 are connected by connecting walls 35 whose extension lines pass through the axis J, respectively, and the central part of each side of the partition wall 33 and the apexes of the partition wall 34 are connected. The extension lines are connected to the outside by connecting walls 36 that pass through the axis J. As a result, a total of six trapezoidal hollow portions 37 having the same shape are formed between the outer peripheral wall 3 and the partition wall 33, and a pentagonal hollow portion 38 is formed between the partition walls 33 and 34. A hexagonal hollow portion 39 is formed inside the partition wall 34. In FIG. 10, reference numeral 32 denotes a detent projection provided on the trapezoidal hollow portion 37 closest to the rim-side projection 2 out of a total of six trapezoidal hollow portions 37.

Tube split body D ₃ of Example 3, as a tube C connects 100 that the annularly, there is fitted into the tire T ₁ of the (26 × 1.95), each unit shown in FIG. 10 The dimensions of L ₃₁ = 38.5 mm, L ₃₂ = 44.5 mm, L ₃₃ = 21.9 mm, L ₃₄ = 10.1 mm, L ₃₅ = 20.0 mm, L ₃₆ = 17.0 mm, t ₃₁ = 1.5 mm.

The thermoplastic polyester elastomer of the flexural modulus 160 MPa, and the tube split body D ₃ was molded by injection molding. As a tube by connecting a total of 100 pieces of tubes split body D ₃ in an annular, it is fitted to the tire T ₁ of the (26 × 1.95). The weight of this tube was 1,040 g, and when the weight of the air tube was subtracted from 400 g, the weight increase as a tire was 640 g, and a lightweight tube could be realized. The riding comfort of the bicycle equipped with the tire T ₁ was close to that of a pneumatic tire. Further, in the rotation test compliant JISK6302, load 90 kg, per hour 40 km, at the test conditions of overcoming the step of 4.5 mm, a result of the running test of 5,000 km, the tube split body D _3, Fatal such as cracking The problem did not occur, and only creep deformation was made flat by 4.5 mm.

Tube split body D ₄ of Example 4 is shown in Figure 11, the tube divided body D ₁ equal or corresponding parts of the first embodiment, the same reference numerals, parts different from the tube divided body D ₁ Will be explained mainly. Tube split body D ₄ is the overall shape and size, except the inside of the partition wall is equal to the tube divided body D ₁ of the first embodiment. The divided body body 1 of the tube divided body D ₄ has one circular through hole 41 concentric with the axis J and a total of six other parts having a center on the substantially same circumference centered on the axis J. The solid part left by forming the circular through-hole 42 symmetrically forms one outer peripheral wall part 43, one partition wall part 44, and six connecting wall parts 45. Yes. Further, among the six circular through holes 42, the circular through hole 42 closest to the rim-side convex part 2 is formed with a ring-shaped detent convex part 46 having the same outer shape, and is connected to each other. The corresponding circular through hole 42 of the tube divided body D ₄ is a detent recess 47 in which the detent protrusion 46 is fitted.

The tube segment D ₄ was molded by injection molding from a thermoplastic polyester elastomer having a flexural modulus of 80 Mpa. As a tube by connecting a total of 100 pieces of tubes split body D ₄ annularly, fitted into the tire T ₁ of the (26 × 1.95). The weight of this tube was 1,370 g, and when the weight of the air tube of 400 g was subtracted, the weight increase as a tire was 970 g, and a lightweight tube could be realized. The riding comfort of the bicycle equipped with the tire T ₁ was close to that of a pneumatic tire. In addition, as a result of a 5,000 km running test under the test conditions of overcoming a step of 90 kg load, 40 km / h and 4.5 mm in a rotation test in accordance with JISK6302, the tube segment D ₄ is fatal such as cracks. The problem did not occur, and only creep deformation was made flat by 3.8 mm.

Is the tube divided body D ₅ of Example 5 are shown in FIGS. 12 and 13. The tube divided body D ₅ is the same as the tube divided body D ₁ of the first embodiment except that the detent protrusion 16 is omitted, and the two adjacent tube divided bodies D ₅ are divided into short regular hexagonal partition walls 4. In this part, the elastic connection body 18 is connected by being fitted and inserted with an elastomer solid short cylindrical elastic connection body 18, and in the connection state of two adjacent tube divided bodies D ₅ , the elastic connection In order to prevent the body 18 from shifting in the circumferential direction, a thicker stopper 19 is formed at the central portion in the circumferential direction of the partition wall 4 than in the other portions in the connected state. The other parts of the tube divided body D ₅ are the same as those of the tube divided body D _{1 of the} first embodiment including the dimensions. In addition, although the elastic coupling body 18 of Example 5 is a solid short columnar shape, when it is a short cylindrical shape, a rebound resilience will fall somewhat, but a tube is reduced in weight.

As shown in FIG. 13, two adjacent tube divisions D ₅ are inserted into each short regular hexagonal partition wall 4 by inserting and inserting an elastic elastic coupling body 18. Are connected to each other. The elastic coupling body 18 acts to reduce the deformation of each tube divided body D ₅ constituting the tube C during traveling of a bicycle or the like, and the elastic coupling body 18 made of elastomer makes the rebound resilience of the entire tube. Since the force required for advancing a bicycle, a wheelchair or the like is reduced, and the adjacent tube divisions D ₅ are connected via the elastic connecting body 18. , annular of the tube C in fitting the tire T _1, it is possible to prevent the said tube C is twisted. Further, since the elastic coupling body 18 is made of a lightweight elastomer, the weight increase due to the elastic coupling body 18 can be minimized.

A thermoplastic polyester elastomer modulus 90Mpa bending, the bending blend material was blended at a ratio of the thermoplastic polyurethane elastomer modulus 35 Mpa (1/1), and the said tube divided body D ₅ molded by injection molding. As a total of 100 tubes by connecting the tube divided bodies D ₅ annularly, fitted into the tire T ₁ of the (26 × 1.95). The weight of this tube was 1,490 g, which was slightly heavier than those of Examples 1 to 4, but the rowing force was light (small) and the ride comfort was more than that of Examples 1 to 4. It was comfortable. Moreover, as a result of performing the rotation test based on JISK6302 under the same conditions as in Examples 1 to 4, no fatal problem such as cracking occurred, and the creep flatness of the tube C was as small as 2.3 mm. It was superior to Examples 1-4.

Comparative example

  A thermoplastic styrene-based elastomer having an A hardness of 30 was foamed with a balloon-type foaming agent, and a rod-shaped foamed elastomer having a diameter of 41 mm and a specific gravity of 0.65 was produced by extrusion molding. This rod-shaped foamed elastomer was cut to 1,950 mm and fitted into a (26 × 1.95) tire as a no-puncture tube. The weight of this no-puncture tube is 1,670 g, and if the weight of the air tube is subtracted from 400 g, the weight increase as a tire is 1,270 g, which is a significant increase in weight compared to the no-puncture tubes of Examples 1 to 4. It became.

In the above, the tube divisions D _{1 to} D ₅ of the optimum embodiment of the present invention have been exemplified, but even the tube division bodies D _{6 to} D ₂₂ having the cross-sectional shape as described below are problems of the present invention. Can be achieved. Thus, it furthers the tube divided bodies D ₆ to D ₂₂ of another embodiment will be briefly described with mainly a front shape (cross-sectional shape).

Each of the tube divided bodies D _{6 to} D ₁₀ shown in FIG. 14 has a “two-layer structure” in which one partition wall having a circular shape, a triangular shape, and a square shape is arranged inside the outer peripheral wall. The tube divided body D ₆ is formed by arranging a circular partition wall 51 concentric with the outer peripheral wall 3, and connecting the outer peripheral wall 3 and the partition wall 51 with a total of four connecting walls 52 arranged vertically and horizontally. Yes, the tube segment D ₇ is different from the tube segment D _{6 only in} that the connecting wall 53 is inclined. In the tube divided body D ₈ , a regular triangular partition wall 54 is arranged inside the outer peripheral wall 3, and each apex portion of the partition wall 54 and the central portion of each side and the outer peripheral wall 3 are connected in total. They are connected by a wall 55. In the tube divided body D ₉ , a square partition wall 56 is arranged inside the outer peripheral wall 3 so that a total of four vertices of a square are located on the vertical plane and the horizontal plane. are those in which the outer peripheral wall 3 are connected by connecting walls 57, the tube divided body D ₁₀ represent respectively the particle diameters with respect to the tube divided body D _9, it is obtained by placing the phase of the square-shaped partition wall 56 45 ° staggered .

Each of the tube divided bodies D _{11 to} D ₁₃ shown in FIG. 15 has a “two-layer structure” in which regular hexagonal partition walls are arranged inside the outer peripheral wall. In the tube divided body D ₁₁ , a regular hexagonal partition wall 61 is arranged inside the outer peripheral wall 3 so that a pair of opposing vertices are positioned in the vertical direction, and each vertex of the partition wall 61 and the outer peripheral wall 3. Are connected by connecting walls 62, and the tube partition D ₁₂ has a partition wall 63 of a large size similar to the partition wall 61 of the tube partition D ₁₁ inside the outer peripheral wall 3. In addition, each vertex of the partition wall 63 and the outer peripheral wall 3 are connected by a connecting wall 64, and the central part of a pair of sides (wall plates) facing the horizontal direction of the partition wall 63 is configured by a horizontal wall. Connected by a connecting wall 65. The tube divided body D ₁₃ has two connecting walls that intersect the interior of the partition wall 63 along the oblique direction by shifting the phase of the partition wall 63 inside the outer peripheral wall 3 by 30 ° in the tube divided body D ₁₂ . 64 is arranged.

Each of the tube divided bodies D _{14 to} D ₁₉ shown in FIG. 16 has a “three-layer structure” in which two partition walls are arranged inside the outer peripheral wall. The tube divided body D ₁₄ has two square partition walls 71 and 72 having different sizes on the inner side of the outer peripheral wall 3, and the phases are shifted by 45 °, and each side (wall plate portion) of the inner partition wall 72. The outer partition wall 71 is directly connected to the outer peripheral wall 3, and the inner and outer partition walls 71, 72 are connected to the inner partition wall 72. Are connected to each other at the apex of The tube division body D ₁₅ is provided with two regular hexagonal and circular partition walls 74 and 75 having different sizes on the inner side of the outer peripheral wall 3, and the outer partition wall 74 is formed at each vertex portion. The partition walls 74 and 75 are connected to the outer peripheral wall 3 via a connecting wall 76, and the partition walls 74 and 75 are connected to the connecting wall 77 at the center of each side (wall plate portion) of the outer regular hexagonal partition wall 74. It is connected via. In the tube partition D ₁₅ , the outer partition wall 74 has a pair of opposing vertices arranged vertically, but in the tube partition D ₁₆ , the outer partition wall 74 has a pair of opposing vertices. The only difference is that the tube segment D ₁₅ is arranged horizontally.

In the tube divided body D ₁₇ , a regular hexagonal partition wall 79 is disposed inside an outer circular partition wall 78, and the outer peripheral wall 3, the partition walls 78, and 79 are connected via connecting walls 81 and 82. They are connected to each other. In the tube divided body D ₁₇ , the connecting wall that is vertically arranged in the connection between the outer peripheral wall 3 and the partition wall 78 so as to prevent buckling deformation of the connecting wall and elastically deform symmetrically, not being used. The tube division body D ₁₈ has two regular hexagonal partition walls 83 and 84 of different sizes arranged on the inner side of the outer peripheral wall 3 with a phase shifted by 30 °, so that the regular hexagonal partition wall 83 is arranged. , 84, the outer peripheral wall 3, the partition wall 83, and the same 84 are connected via connecting walls 85, 86. The tube division body D ₁₉ is obtained by integrating the regular hexagonal partition walls 83 and 84 arranged inside and outside the tube division body D _{18 and} shifting the phase by 30 °.

Each of the tube divided bodies D _{20 to} D ₂₂ shown in FIG. 17 has only a connecting wall, and has a structure that enables weight reduction as a tube and secures appropriate rebound resilience. The tube divisions D _{20 to} D ₂₂ each have two types of connecting walls 91 and 92 that are inclined by 45 ° in different directions, thereby ensuring weight reduction and proper rebound resilience as a tube. Only the number is different, and in the tube divided bodies D _{20 to} D ₂₂ , two, three, and four connecting walls 91, 92 are arranged to intersect each other.

  In the above invention, the partition wall is provided inside the outer peripheral wall to form a hollow structure, so that a large number of tube divided bodies that are reduced in weight are connected in an annular shape via a connecting portion, so that the total number of connections can be increased. It is a tube that can be fitted to tires of different sizes related to the wheel diameter by changing the circumferential length by changing, but the idea to form a ring by connecting a number of divided bodies via a connecting part is a tube The present invention can be applied not only to tires, and examples thereof are shown in FIGS.

The tire T ₀ is for a baby stroller, and as shown in FIGS. 18 and 19, in the same manner as the tube C described above, a large number of tire divided bodies D ₀ are connected in an annular shape via connecting portions. It has been done. In the embodiment, a total of 46 tire divided bodies D ₀ are connected in an annular shape, and the front shape of the tire divided body D ₀ is the same as that of the tube divided body D _13. The partition wall 102 having a shape is arranged so that one side (one wall plate portion) thereof is horizontal, and each vertex portion of the partition wall 102 and the outer peripheral wall 101 are connected by a connecting wall 103, The wall plate portions arranged in the diagonal direction of the partition wall 102 are connected by two (two) connecting walls 104 intersecting in the diagonal direction. The ground contact portion of the outer peripheral wall 101 of the tire divided body D ₀ is formed to be thicker than the other portions, and a tread 105 for increasing the ground resistance in the circumferential direction (the die cutting direction at the time of injection molding) is provided. Is formed. The tread 105 can be easily formed by molding.

Here, in the state where the concatenation of a number of tires divided body D ₀ annularly, both end faces of the two tires divided bodies D ₀ which are connected each other, with in close contact without a gap, in coupled condition, the coupling gap that it does not exist, is different from the tube C that is the concatenation of multiple of the tube split bodies D ₁ annularly.

In the tire rim R ₀ that supports the anti-ground side of the tire T _0, an annular tire rim portion 107 is integrally formed on the outer peripheral portion of the disc portion 106, and a bearing portion 108 is formed at the center of the disc portion 106. Is integrally formed, and is divided into two parts in a sectional view so that the tire T ₀ can be fitted. That is, the tire rim divided body R ₀₁ has a structure in which the tire rim R ₀ is divided into two parts in a cross-sectional view, and the half tire rim divided body 107 a is integrally formed on the outer periphery of the disk part divided body 106 a having a half thickness. The bearing part divided body 108a is integrally formed at the center of the disk part divided body 106a. In the disk portion divided body 106a, two bolt insertion holes 109 are formed along the radial direction at each portion divided into four equal parts along the circumferential direction, and around each bolt insertion hole 109, A protective cylinder 111 having a regular hexagonal hole formed therein is integrally formed. In the case of a small tire, the number of bolt insertion holes 109 along the radial direction in the disk portion divided body 106a may be one.

Therefore, a large number of tire divided bodies D ₀ are connected in an annular shape to form a tire T ₀ , and the tire T ₀ is disposed between a pair of spaced tire rim divided bodies R ₀₁ in this state. , tire rim portion 107 when the joined together each disk portion divided body 106a of the pair of tire rim divided bodies R ₀₁ in a plurality of hexagonal Anazuke bolts 112 and nuts 113, is formed by coalescence of a pair of tire rim portions divided body 107a In addition, the part on the anti-grounding side of the tire T ₀ is supported. Note that in FIG. 18 and FIG. 19, 114, disk portion 106 relative to the shaft 115 indicates the bearing for supporting rotatably the tire rim R ₀ provided integrally.

Since the load (ground pressure) acting on the tire T ₀ of the stroller is not so large, even the tire T ₀ in which a large number of tire divided bodies D ₀ are connected in an annular shape can sufficiently withstand use.

Since the tire T ₀ is a tubeless tire, there is no possibility of occurrence of puncture, and the entire tire is reduced in weight, and each tire divided body D ₀ is elastically deformed by a ground pressure when the stroller is running. Thus, rebound resilience is obtained and riding comfort is ensured. Also, depending on the size of the stroller, the wheel diameter of the tire is converted, if the thickness of the tire is the same, it is possible to cope with the total number of linked adjusting the tire divided body D _0.

In addition, by coloring the outer peripheral surface of the connection portion where the end surfaces of each tire divided body D ₀ are in close contact with each other along the direction of the close contact portion, the rotation state of the tire is shown to the infant when the stroller is not used. Thus, a large number of colored portions can be recognized, and it can also be used as an educational tool that can teach the fun of tire rotation.

C: No puncture tube
D ₀ : Tire divided body
D ₁ to D _22: Tube split body
E: Connection gap
E ₁ , E ₂ : Split connection gap
F: Ground pressure
J: Tire axis
K: Connection part of the tube segment
R ₀ : Stroller tire rim
R ₀₁ : Tire rim divided body
R ₁ : Tire rim of a bicycle or the like
3: The outer wall of the tube
4,24,33,34,44,51,54,56,61,63,71,72,74,75,78,79,83,84: Tube partition
5,25,26,35,36,45,52,53,55,57,62,64,65,73,76,77,81,82,85,91,92 ： Tube connecting wall
11: Connection locking piece
12: Connection locking hole
18: Elastic coupling body 16, 32, 46: Detent projection
17, 47: Detent recess
101: tire outer peripheral wall
102: tire partition wall 103, 104: tire connecting wall

Claims (14)

  A large number of plastic tube divided bodies having an outer shape corresponding to the inner shape in a cross-sectional view of the tire are formed in an annular shape by being connected along the circumferential direction via a connecting portion. No puncture tube, characterized by   The connecting portion is formed on a pair of connecting locking pieces protruding from a rim fitting side portion of one opposing end face of two tube divided bodies connected to each other and a similar portion on the other opposing end face. The no-puncture tube according to claim 1, wherein the no-puncture tube is constituted by a connection locking hole.   The plurality of tube segments are connected via a connecting portion having a connecting gap along the connecting direction, so that the circumference changes in a state of tubes connected in an annular shape. The no-puncture tube of 1 or 2.   Each length along the connecting direction on the grounding surface side and the rim fitting side of the tube divided body has a length on the grounding surface side corresponding to the difference in circumferential length between the inside and outside of the tire. The no-puncture tube according to any one of claims 1 to 3, wherein the tube is slightly longer than the length.   The no-puncture tube according to any one of claims 1 to 4, wherein the tube divided body has a hollow structure in which an inner side of an annular outer peripheral wall is partitioned left and right symmetrically by a partition wall.   The partition wall is provided with a single-layer or multiple-layer partition wall portion made of a regular polygon, a circle, or a combination of both shapes concentric with the center of the cross section of the tube divided body, and each partition wall portion is formed by a connecting wall. The no-puncture tube according to claim 5, wherein the outermost partition walls are connected to each other and are connected to the outer peripheral wall by a connection wall.   The no-puncture tube according to claim 5 or 6, wherein the partition wall portion constituting the partition wall does not include a vertical wall portion or a horizontal wall portion that directly connects the opposed portions of the outer peripheral wall.   5. The tube divided body according to claim 1, wherein a plurality of through-holes along the connecting direction are provided symmetrically to form portions having functions of an outer peripheral wall and a partition wall. The no-puncture tube in any one.   The no-puncture tube according to any one of claims 1 to 8, wherein each tube divided body is connected in a state of being prevented from being rotated by a rotation stop portion, whereby torsional rigidity is increased.   The rotation stop portion is formed by a partition wall portion and an outer peripheral wall of one opposing end surface of two tube divided bodies connected to each other, or protrudes from a divided hollow portion formed by the partition wall portions. The no-puncture tube according to claim 9, wherein the no-puncture tube is configured by fitting a rotation-preventing convex portion and a rotation-stopping concave portion including a corresponding divided hollow portion of the other facing end surface.   The innermost partition wall of the tube divided body is formed in a short cylindrical shape, and two adjacent tube divided bodies are solid short columnar or short cylindrical elastomers fitted and inserted into the respective partition walls. The no-puncture tube according to any one of claims 1 to 8, wherein the no-puncture tubes are connected to each other through an elastic connecting body made of the metal.   The no-puncture tube according to any one of claims 1 to 11, wherein said tube division object is fabricated with thermoplastics.   The no-puncture tube according to claim 12, wherein the thermoplastic plastic is a thermoplastic elastomer having a flexural modulus of (50 to 500) MPa. A tire formed by connecting annularly a tire structure having a hollow structure made of plastic divided into a large number along the circumferential direction,
The tire divided body has a hollow structure by the inside of the annular outer peripheral wall being partitioned by a partition wall,
A large number of tire divided bodies connected in an annular shape are characterized in that a tire rim side portion is fitted to a tire rim having a divided structure divided in two in a cross-sectional view, and the remaining portion is exposed. tire.

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